/**
* Returns the specified function.
*
* @param name name of the function
* @param args optional arguments
* @param ii input info
* @return function instance
*/
TypedFunc get(final QNm name, final Expr[] args, final InputInfo ii) {
final int id = indexOf(name, args);
if (id == -1) return null;
// function has already been declared
final UserFuncCall call = add(ii, funcs[id].name, id, args);
final FuncType type = FuncType.get(funcs[id]);
return new TypedFunc(call, type);
}
